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Somatic pairing, endomitosis and chromosome aberrations in snakes (Viperidae and Colubridae) Anais da ABC (AABC)
Beçak,Maria Luiza; Beçak,Willy; Pereira,Alexandre.
The positioning of macrochromosomes of Bothrops jararaca and Bothrops insularis (Viperidae) was studied in undistorted radial metaphases of uncultured cells (spermatogonia and oogonia) not subjected to spindle inhibitors. Colchicinized metaphases from uncultured (spleen and intestine) and cultured tissues (blood) were also analyzed. We report two antagonic non-random chromosome arrangements in untreated premeiotic cells: the parallel configuration with homologue chromosomes associated side by side in the metaphase plate and the antiparallel configuration having homologue chromosomes with antipolar distribution in the metaphase ring. The antiparallel aspect also appeared in colchicinized cells. The spatial chromosome arrangement in both configurations is...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Snakes; Somatic pairing; Chromosome positioning; Endomitosis; Diplochromosomes.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000300004
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